3.4: equations of lines day 2 tuesday, september 22, 2015 geometry

3.4: EQUATIONS OF LINES DAY 2

TUESDAY, SEPTEMBER 22, 2015

GEOMETRY

HORIZONTAL & VERTICAL LINES

*DON’T FORGET ABOUT MR. SLOPE GUY!

POINT-SLOPE FORM

EXAMPLE 1

Write an equation in point-slope form of the line whose slope is that contains (–10, 8). Then graph the line.

EXAMPLE 2Write an equation in point-slope form of the line whose slope is that contains (6, –3).

A.

B.

C.

D.

PARTNER ACTIVITY

• You will need a handout.

• You will also need a small piece of paper with a graph. Keep this hidden from your partner!

• Make sure the letter on your handout matches the letter on the small piece of paper.

PARTNER ACTIVITY

1. Describe the line.

For example:

“The line has a slope of 2 and passes through the point (1,1).”

PARTNER ACTIVITY

TRADE PAPERS!

2. Graph the line your partner described.

PARTNER ACTIVITY

TRADE!

Does your partner’s graph match the one you were given?

If not, talk to your partner….what mistakes were made?

3. Write the equation of the line described.

PARTNER ACTIVITY

TRADE!

Do you agree with the equation of the line?

Talk to your partner if you disagree.

4. Write the equation of the line that is parallel thought the given point. Then graph that parallel line.

PARTNER ACTIVITY

TRADE!

Do you agree with the equation of the line?

Talk to your partner if you disagree.

5. Write the equation of the line that is perpendicular thought the given point. Then graph that perpendicular line.

PARTNER ACTIVITY

TRADE!

Do you agree with the equation of the line?

Talk to your partner if you disagree.

3.4 DAY 2 HOMEWORK

• Finish the back side of the 3.4 Day 2 worksheet